Definition: The associative property states that you can add or multiply regardless of how the numbers are grouped. By 'grouped' we mean 'how you use parenthesis'.
When you are having difficulty breathing, or your chest is tight, or when you are wheezing, Ventolin Rotacaps open up the breathing tubes in your lungs to help with breathing. Because the medicine in your Ventolin Rotacaps gives fast relief from your chest symptoms, it is often called a 'reliever'.
As a summary, CPAP stands for continuous positive airway pressure. These machines blow a constant level of positive air pressure through a mask into your nose (or nose and mouth). Bilevel PAP refers to a machine that delivers two different levels, where a higher pressure is used during inhalation and a much lower pressure is given during exhalation.